NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Banking and Thrift, Interest [Abstract]
Net interest income	$ 88,421	$ 90,334	$ 92,759	$ 97,533	$ 102,092	$ 92,084	$ 81,358	$ 69,063	$ 369,047	$ 344,597	$ 291,166
Provision expense/(benefit) for credit losses	7,000	8,000	8,000	8,999	12,000	3,000	0	(4,000)	31,999	11,000	(500)
Net interest income after provision for credit losses									337,048	333,597	291,666
Total non-interest income	(8,383)	17,465	17,094	16,606	15,654	16,251	16,351	20,681	42,782	68,937	143,248
Total non-interest expense	78,992	76,513	74,048	71,955	70,014	81,677	68,475	68,550	301,508	288,716	285,893
Income before income taxes	(5,954)	23,286	27,805	33,185	35,732	23,658	29,234	25,194	78,322	113,818	149,021
Income tax expense	$ (4,509)	$ 3,741	$ 3,944	$ 5,548	$ 5,227	$ 4,941	$ 6,119	$ 4,998	8,724	21,285	30,357
Net income									$ 69,598	$ 92,533	$ 118,664